Deep comprehensive resource utilization method for electrolytic cell overhaul slag

A technology for overhauling slag and electrolytic cells, which is applied in the electrolysis process, electrolysis components, and solid waste removal.

Active Publication Date: 2013-03-20
周俊和 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of this method are also very obvious: fluorine is harmful to refractory bricks, and fluorine is easily discharged into the air with flue gas to cause air pollution; the sodium content in waste cathode carbon blocks is extremely high, which will affect the later strength of cement
[0009] 3. As early as 1982, Shandong Aluminum Plant began to use waste carbon blocks to add alumina clinker to kilns to replace part of anthracite coal. Although it has passed the national appraisal and achieved good results, it cannot achieve large quantities and high added value. use
[0010] 4. Research on waste SiC-Si3N4 waste refractory brick treatment technology is basi

Method used

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  • Deep comprehensive resource utilization method for electrolytic cell overhaul slag

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Embodiment 1

[0032] Embodiment 1 of the present invention. The method for deep resource utilization and comprehensive utilization of electrolyzer overhaul slag comprises the following steps:

[0033] a. Sorting the slag from the overhaul of the electrolytic cell to obtain electrolyte blocks, cathode rods, waste cathode carbon blocks, waste refractory bricks, waste heat insulation bricks, waste heat insulation boards, waste paste, and the remaining mixed slag. Among them, the electrolyte block material is mainly aluminum, which can be directly recycled to the electrolytic aluminum plant, and the cathode rod is iron rod, which can also be directly recycled.

[0034]b. Carry out water immersion to waste cathode carbon block, fluoride salt is dissolved in water, and the cathode carbon block that has absorbed fluoride salt will disperse, obtain the powder material and block material that immerse and disperse, select the block material among them, The selected block material has less fluoride s...

Embodiment 2

[0041] Embodiment 2 of the present invention. The method for deep resource utilization and comprehensive utilization of electrolyzer overhaul slag comprises the following steps:

[0042] a. Sorting the overhaul slag of the electrolytic cell to obtain electrolyte blocks, cathode rods, waste cathode carbon blocks, waste refractory bricks, waste heat insulation bricks, waste heat insulation boards, waste paste, and the remaining mixed slag.

[0043] b. Soak the waste cathode carbon block in water for 2-3 days to obtain soaked and dispersed powder and block material, select the block material with a particle size greater than 5 cm, and crush the selected block material to a particle size of 2 cm , water immersion again, select the block material with a particle size greater than 1 cm, as the aggregate for making the cathode carbon block, and the remaining powder is ground and floated to obtain carbon powder. The obtained cathode carbon block aggregate and carbon powder are dried ...

Embodiment 3

[0050] Embodiment 3 of the present invention. The method for deep resource utilization and comprehensive utilization of electrolyzer overhaul slag comprises the following steps:

[0051] a. Sorting the overhaul slag of the electrolytic cell to obtain electrolyte blocks, cathode rods, waste cathode carbon blocks, waste refractory bricks, waste heat insulation bricks, waste heat insulation boards, waste paste, and the remaining mixed slag.

[0052] b. Soak the waste cathode carbon block in water for 2-3 days to obtain soaked and dispersed powder and block material, select the block material with a particle size greater than 1 cm, and crush the selected block material to a particle size of 0.5 cm , water immersion again, select the blocks with a particle size greater than 0.3 cm, dry them as aggregates for making cathode carbon blocks, and grind the remaining powders and flotation to obtain carbon powder. The obtained cathode carbon block aggregate and carbon powder are dried an...

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Abstract

The invention discloses a deep comprehensive resource utilization method for electrolytic cell overhaul slag. The method is characterized by comprising the following steps of: sorting electrolytic cell overhaul slag, respectively obtaining electrolyte blocks, cathode bars, waste cathode carbon blocks, waste refractory bricks, waste insulating bricks, waste heat-insulating plates, waste paste and residual mixed slag charge; respectively leaching the sorted blocks in water, crushing and leaching after the blocks are selected, recovering the selected blocks, grinding and floating the residual powder, selecting carbon powder and refractory material powder, and manufacturing a metallurgical slag former from the residual powder. According to the method, fluoride salts which are difficultly removed in the electrolytic cell overhaul slag are separated, the recycling value of the electrolytic cell overhaul slag is improved, waste materials are changed into valuable materials, economic and pollution-free recovery of the electrolytic cell overhaul slag is realized, and the pollution hidden danger is fundamentally eliminated.

Description

[0001] technical field [0002] The invention relates to a deep resource comprehensive utilization method of electrolyzer overhaul slag, and belongs to the technical field of electrolyzer overhaul slag treatment. Background technique [0003] Aluminum electrolytic cells generally need to be overhauled after 4 to 5 years of use. The average cell life of most enterprises in my country is about 1500 days. The waste lining removed during the overhaul is the overhaul slag of the electrolytic cell, which contains soluble fluoride. Overhaul slag mainly includes waste cathode carbon blocks, waste refractory bricks, paste, waste insulation bricks, refractory powder, refractory mortar and waste insulation boards, etc. The production amount is about 30kg / t·Al (relative number, which varies with the age of the tank). At present, the national electrolytic aluminum production capacity exceeds 9 million t / a, and the overhaul slag production is about 270,000 t / a. [0004] Aluminum electrol...

Claims

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Application Information

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IPC IPC(8): C25C3/06C25C7/06B09B3/00C04B35/66
Inventor 邹建明
Owner 周俊和
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